Pat the chicken breast dry and cut into 1-inch bite-sized cubes, then season with sea salt and black pepper.
In a small bowl, whisk together the coconut aminos, rice vinegar, raw honey, tomato paste, and sesame oil to create the sauce.
Heat the extra virgin olive oil in a large skillet or wok over medium-high heat.
Add the chicken to the skillet and sauté for 5-6 minutes until golden brown and cooked through, then remove and set aside.
In the same skillet, add the sliced bell peppers, red onion, minced ginger, and minced garlic, stir-frying for 3-4 minutes until the vegetables are tender-crisp.
Add the pineapple chunks and the cooked chicken back into the skillet.
Pour the sauce over the mixture and toss constantly for 1-2 minutes until the sauce thickens and glazes the ingredients.
Serve the sweet and sour stir-fry immediately over the warm cooked brown rice.